EP0556266B1 - Spritzgiessform - Google Patents

Spritzgiessform Download PDF

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Publication number
EP0556266B1
EP0556266B1 EP91920100A EP91920100A EP0556266B1 EP 0556266 B1 EP0556266 B1 EP 0556266B1 EP 91920100 A EP91920100 A EP 91920100A EP 91920100 A EP91920100 A EP 91920100A EP 0556266 B1 EP0556266 B1 EP 0556266B1
Authority
EP
European Patent Office
Prior art keywords
mould
injection
mould part
cavity
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91920100A
Other languages
English (en)
French (fr)
Other versions
EP0556266A1 (de
Inventor
Jürg FREI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GPT Axxicon BV
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GPT Axxicon BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by GPT Axxicon BV filed Critical GPT Axxicon BV
Publication of EP0556266A1 publication Critical patent/EP0556266A1/de
Application granted granted Critical
Publication of EP0556266B1 publication Critical patent/EP0556266B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2896—Closure devices therefor extending in or through the mould cavity, e.g. valves mounted opposite the sprue channel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/30—Flow control means disposed within the sprue channel, e.g. "torpedo" construction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/81—Sound record

Definitions

  • the invention relates to an injection mould for manufacturing disc-shaped plastic articles with a central hole, which mould comprises: a first mould part; a second mould part displaceable relative to the first mould part by means of first displacing means; which two mould parts are displaceable between a closed first position, in which they together partially bound a mould cavity corresponding to the shape of an article to be manufactured, and an open second position in which a formed article can be taken out; a third mould part which, in the closed position of the first and second mould parts, extends through the mould cavity defined thereby and has a shape in the region of this mould cavity which corresponds to the shape of the central hole, which third mould part is axially displaceable by means of second displacing means by means of a guide sleeve forming part of the first mould part between a first position, in which it partially forms a bounding of the mould cavity, and a second retracted position; and which third mould part bounds a channel that is connectable at the free outside end to an injection nozzle of an injection
  • the third mould part has, in the region of the mould cavity during moving of the third mould part from its first to its second position, a cylindrical shape. Due to that shape during displacement of the third mould part the cylindrical outer wall of this third mould part is in mechanical contact with the inner wall of the central hole of the formed article during the third mould parts' displacement. This may be disadvantageous for the correct and accurate shape of the central hole.
  • the invention provides an injection mould of the type mentioned in the preamble, which is, according to the proposal of the invention, characterized by the third mould part having a releasing form in the region of the mould cavity during moving of the third mould part from the first to the second position.
  • the invention provides a mould of the said type having the feature that the second displacing means comprise an ejector extending through the second mould part.
  • the injection inlet comprises a plurality of arranged ordered injection inlet openings.
  • a completely homogenous inflow pattern of the heated plastic into the moulded cavity is assured with an embodiment with the feature that the injection inlet is embodied as an injection inlet opening extending around the entire periphery of the third mould part.
  • the device preferably displays the characteristic that the third mould part comprises a first heating element.
  • the special feature can be added that the third mould part is elongate in its moving direction, that the channel extends in lengthwise direction and has the form of a cylinder jacket over a portion of considerable length to the injection inlet, and that the first heating element is situated inside this cylinder jacket.
  • the device has the feature that in the first mould part a second heating element is accommodated surrounding the third mould part.
  • the device can display the feature that the second heating element is thermally insulated from the first mould part.
  • openings debouching on one of the flat walls of the mould cavity for passage of pressurized gas for removing a formed article in the second position of the first and the second mould parts.
  • a separate insert generally designated as a stamper, on which the information is present in negative form.
  • This stamper a nickel disc, is fixedly held by per se known means on a flat end wall of the disc-shaped mould cavity. The blow out openings as described above debouch on the other wall of the mould cavity.
  • the device can have the feature in a particular embodiment that the walls of the channel are provided with a heat resistant anti-stick layer.
  • the figures show an injection mould 1 for manufacturing a disc-shaped information carrier 2 with a central hole 3.
  • the mould 1 comprises a first mould part 4, a second mould part 5 displaceable relative to this first mould part 4 by means of first displacing means (not shown) which two mould parts 4, 5 are displaceable between a closed first position in figure 1 wherein they together partially bound a disc-shaped mould cavity 6 corresponding to the shape of the information carrier 2 to be manufactured, and an open second position shown in figure 3 wherein the formed information carrier 2 can be taken out;
  • a third mould part 7 which in the closed position according to figure 1 extends through the mould cavity 6 defined by the mould parts 4, 5 and in the region of the mould cavity 6 has a shape which corresponds to the shape of the central hole 3, which third mould part 7 is axially displaceable with the mould parts 4, 5 by means of an ejector 8 by means of a guide sleeve 9 forming part of the first mould part 4 between the first position shown in figure 1, in which it partially forms a bounding of the
  • the cylinder jacket-like channel 10 is bounded by a cylinder-shaped core 14 in which is received an elongate heating element 15 and a sleeve 16 extending therearound.
  • the core 14 and the sleeve 16 are held at a mutual distance by means of spacers 17.
  • the core 14 has a central coaxial bore 18 which, by means of borings 19, can transport the plastic coming from the injection nozzle 12 via the free end 11 and the channel 10 to the annular injection inlet openings 13 for injection into the mould cavity 6.
  • the core 14, and therewith the outside wall of the third mould part 7 has a very slightly conical tapering shape, which serves for easy release of a formed information carrier.
  • the conical shape is depicted somewhat exaggeratedly for the sake of clarity.
  • An access opening 21 closable by means of a threaded plug 20 serves for admitting the central heating element 15.
  • a cylinder jacket-like heating element 23 Placed in a space 22 around the third mould part 7 is a cylinder jacket-like heating element 23, which can generate its heat to the third mould part 7 via the guide sleeve 9 for keeping the plastic present therein in the plastic state.
  • the heating element 23 and the guide sleeve 9 are supported on the underside by means of a wear-resistant carrier ring 24 of heat insulating, non-fibrous material, for example a ceramic material, titanium or plastic.
  • a wear-resistant carrier ring 24 of heat insulating, non-fibrous material, for example a ceramic material, titanium or plastic.
  • the guide sleeve is carried by a wear-resistant, pressure-resistant guide ring 25.
  • a heating element 27 is likewise placed around a connecting block 26 between the core 14 and the injection nozzle 12.
  • Connecting wires of the various heating elements are generally designated with 28. These are connected to a suitable power supply.
  • a stamper 29 is situated on the flat wall of the mould cavity 6 which forms part of the second mould part 5. This is held in position by known means not shown here. Such means can be based on underpressure, magnetic forces or take a mechanical form. For removing a formed plastic article openings for blowing in air 30 are present, which are connected via lines 31 to selectively energizable compressed air means (not drawn).
  • a ring 32 which is connected by means of bolts 33 to the first mould part 4 and serves for positioning of the guide and carrier ring 25.
  • the first mould part 1 is displaceable relative to the injection nozzle 12.
  • a carrier ring 34 is slidably guided in the frame part 35 for this purpose.
  • Air 36 is blown through the openings 30 to remove this information carrier 2.
  • the inner surface of the bores 18 and 19 and the channel 10 is provided with a heat resistant coating layer which prevents the adhesion of heated plastic.
  • FIG. 4 shows the heating element 15 in detail.
  • This heating element comprises a cylindrical body 38 which is of ceramic material and is ground to a round shape.
  • the body 38 is closed off on the bottom with a cured mould mass 39 consisting of Al2O3.
  • thermocouple 41 which is connected to connecting wires 42 and serves for adjusting the power supply through the wires 28 for holding the temperature constant within determined limits.
  • the heating wire is embedded in Al2O3.
  • the wires 28 are insulated by means of a temperature-resistant sheath with glass fibres.
  • FIG. 5 shows the heating element 23.
  • This comprises a cylinder jacket-like body 43 in which heating coils 45 mutually connected in series are received in lengthwise channels 44, which heating coils 45 receive their power supply from wires 28 which are insulated with a temperature-resistant sheath with glass fibres.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Surgical Instruments (AREA)

Claims (11)

  1. Spritzgußform (1) zur Herstellung scheibenförmiger Plastikgegenstände (2), die mit einem zentralen Loch (3) versehen sind, wobei die Spritzgußform folgende Teile aufweist:
    - einen ersten Formteil (4);
    - einen zweiten Formteil (5), der relativ zu dem ersten Formteil (4) durch eine erste Verschiebevorrichtung versetzbar ist;
    - wobei die beiden Formteile (4, 5) zwischen einer ersten Schließstellung, in der sie zusammen teilweise einen Formhohlraum (6) umschließen, der der Gestalt des herzustellenden Gegenstandes (2) entspricht, und einer zweiten Öffnungsstellung verschiebbar sind, in der ein ausgeformter Gegenstand (2) entnommen werden kann;
    - einen dritten Formteil (7), der sich in Schließstellung von erstem und zweitem Formteil (4, 5) durch den hierdurch definierten Formhohlraum erstreckt und im Bereich des Formhohlraumes (6) eine Form hat, die der Form des zentralen Loches (3) entspricht, wobei der dritte Formteil (7) axial durch eine zweite Verschiebevorrichtung (8) mittels einer einen Abschnitt des ersten Formteils (4) bildenden Führungshülse (9) zwischen einer ersten Stellung, in der teilweise der Formhohlraum (6) begrenzt wird, und einer zweiten zurückgezogenen Stellung verschiebbar ist; und
    - wobei der dritte Formteil (7) einen Kanal (10) bildet, der am freien äußeren Ende (11) mit einer Einspritzdüse (12) einer Spritzgußmaschine in Verbindung steht, während das andere Ende des Kanals mit einem Einspritzeinlaß (13) im Bereich des Formhohlraumes in der ersten Stellung von erstem und zweitem Formteil (4, 5) und der ersten Stellung des dritten Formteils (7) in Verbindung steht, während in der zweiten Stellung des dritten Formteils (7) der Kanal durch die Innenwand der Führungshülse (9) abgesperrt ist;
    - Heizeinrichtungen, um das im Kanal befindliche Plastikmaterial in plastischem Zustand zu erhalten,
    dadurch gekennzeichnet,
    daß der dritte Formteil (7) im Bereich des Formhohlraumes eine sich verjüngende Gestalt besitzt, um während der Bewegung des dritten Formteils (7) aus der ersten in die zweite Stellung eine Freigabe zu bewirken.
  2. Spritzgußform nach Anspruch 1,
    dadurch gekennzeichnet, daß die zweite Verschiebevorrichtung einen Auswerfer (8) aufweist, der sich durch den zweiten Formteil (5) erstreckt.
  3. Spritzgußform nach Anspruch 1,
    dadurch gekennzeichnet, daß der Einspritzeinlaß (13) aus mehreren umfangsmäßig angeordneten Einspritzeinlaßöffnungen besteht.
  4. Spritzgußform nach Anspruch 1,
    dadurch gekennzeichnet, daß der Einspritzeinlaß (13) als Einspritzeinlaßöffnung ausgebildet ist, die sich über den gesamten Umfang des dritten Formteils (7) erstreckt.
  5. Spritzgußform nach Anspruch 1,
    dadurch gekennzeichnet, daß der dritte Formteil (7) ein erstes Heizelement (23) aufweist.
  6. Spritzgußform nach Anspruch 5,
    dadurch gekennzeichnet, daß der dritte Formteil (7) in seiner Bewegungsrichtung langgestreckt ist, daß sich der Kanal (10) in Längsrichtung erstreckt und über einen Abschnitt beträchtlicher Länge bis zum Einspritzeinlaß (13) die Gestalt einer Zylinderhülse aufweist, und daß das erste Heizelement (23) innerhalb dieser Zylinderhülse (10) angeordnet ist.
  7. Spritzgußform nach Anspruch 6,
    dadurch gekennzeichnet, daß der zylinderhülsenartige Teil des Kanals (10) durch eine äußere Hülse und eine innere Hülse (9) begrenzt ist, und daß diese Hülsen in ihrer Relativstellung durch Abstandshalter fixiert sind.
  8. Spritzgußform nach Anspruch 6,
    dadurch gekennzeichnet, daß ein zweites Heizelement (27), das den dritten Formteil umschließt, im ersten Formteil (4) angeordnet ist.
  9. Spritzgußform nach Anspruch 8,
    dadurch gekennzeichnet, daß das zweite Heizelement (27) thermisch von dem ersten Formteil isoliert ist.
  10. Spritzgußform nach Anspruch 1,
    dadurch gekennzeichnet, daß die Öffnungen sich nach einer der flachen Wände des Formhohlraumes hin öffnen, um Druckgas (30) hindurchzuleiten und einen hergestellten Gegenstand (2) in der zweiten Stellung von erstem und zweitem Formteil (4, 5) auszuwerfen.
  11. Spritzgußform nach Anspruch 1,
    dadurch gekennzeichnet, daß die Wände des Kanals (10) mit einer hitzebeständigen Antihaftschicht versehen sind.
EP91920100A 1990-11-09 1991-11-08 Spritzgiessform Expired - Lifetime EP0556266B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP305618/90 1990-11-09
JP2305618A JPH0710546B2 (ja) 1990-11-09 1990-11-09 加熱装置を有するゲート装置
PCT/NL1991/000225 WO1992008597A1 (en) 1990-11-09 1991-11-08 Injection mould

Publications (2)

Publication Number Publication Date
EP0556266A1 EP0556266A1 (de) 1993-08-25
EP0556266B1 true EP0556266B1 (de) 1995-08-16

Family

ID=17947307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91920100A Expired - Lifetime EP0556266B1 (de) 1990-11-09 1991-11-08 Spritzgiessform

Country Status (14)

Country Link
US (1) US5324190A (de)
EP (1) EP0556266B1 (de)
JP (1) JPH0710546B2 (de)
KR (1) KR0184241B1 (de)
CN (1) CN1038235C (de)
AT (1) ATE126473T1 (de)
AU (1) AU655443B2 (de)
CA (1) CA2095011A1 (de)
CZ (1) CZ286809B6 (de)
DE (1) DE69112221T2 (de)
ES (1) ES2075473T3 (de)
HK (1) HK198296A (de)
RU (1) RU2072918C1 (de)
WO (1) WO1992008597A1 (de)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09277320A (ja) * 1996-04-10 1997-10-28 Otto Maenner 射出成形型と協働するニードル閉鎖弁
US5783234A (en) * 1996-07-25 1998-07-21 Husky Injection Molding Systems Ltd. Hot runner valve gate for eliminating unidirectional molecular orientation and weld lines from solidified resin used for forming molded articles
EP0936965B1 (de) * 1996-11-01 2001-04-25 Christian René Stern Spritzgussdüse
CA2269230A1 (en) * 1996-11-01 1998-05-14 Husky Injection Molding Systems Ltd. Apparatus for and method of injection molding
MY120997A (en) * 1997-07-11 2005-12-30 Sony Corp Combined-type mold for injection molding and method of producing rotary member by the mold
US5840231A (en) * 1997-08-14 1998-11-24 Husky Injection Molding Systems Ltd. Valve gate assembly
US6074593A (en) * 1998-03-13 2000-06-13 Osuna-Diaz; Jesus`M. Core pin arrangement and method for injection molding
NL1008579C2 (nl) * 1998-03-13 1999-09-14 Axxicon Moulds Eindhoven Bv Spuitgietmatrijs voor schijfvormige kunststof voorwerpen.
EP1062083B1 (de) 1998-03-13 2005-09-21 Axxicon Moulds Eindhoven B.V. Spritzgussmatrizze für scheibenartigen gegenstand aus kunststoff und mehrfach-spritzgiessform
NL1010868C2 (nl) * 1998-12-22 2000-06-27 Axxicon Moulds Eindhoven Bv Spuitgietmatrijs voor schijfvormige kunststof voorwerpen en spuitgieteenheid.
DE19960494A1 (de) * 1999-12-15 2001-06-21 Knoll Ag Vorrichtung und Verfahren zum Herstellen von festen wirkstoffhaltigen Formen
WO2001054882A1 (de) * 2000-01-31 2001-08-02 Günther Heisskanaltechnik Gmbh Düse für spritzgiesswerzeuge und düsen-anordnung
CA2317779A1 (en) * 2000-09-06 2002-03-06 Mold-Masters Limited Valve gate assembly for injection molding
US20020185215A1 (en) * 2001-05-04 2002-12-12 Ortiz Kim A. System and process for manufacturing fastening mechanisms which connect articles and the like together
US20050181090A1 (en) * 2002-12-06 2005-08-18 Mold-Masters Limited Injection molding nozzle with embedded and removable heaters
JP2005254480A (ja) * 2004-03-09 2005-09-22 Nippon Densan Corp バルブゲート式射出成形装置及び方法
US7226283B2 (en) * 2004-10-13 2007-06-05 Mold-Masters Limited Injection molding apparatus with a melt channel in valve pin
DE102005050360B4 (de) * 2004-10-20 2015-11-05 Mold-Masters (2007) Limited Spritzgiessvorrichtung mit Seitenanguss
EP1724090B1 (de) * 2005-05-19 2010-07-21 Mold-Masters (2007) Limited Spritzgießdüse mit einer wärmeleitenden Hülse und Verfahren zu deren Herstellung
KR100741657B1 (ko) * 2005-09-09 2007-07-23 베스너 주식회사 사출성형용 금형
DE102012102549A1 (de) * 2011-11-15 2013-05-16 Ferrofacta Gmbh Druckgussdüse und Verfahren zum Betrieb der Druckgussdüse
CN106313436A (zh) * 2016-08-18 2017-01-11 台州市黄岩坤泰模具有限公司 高光塑料件的注塑模具及加工方法

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Publication number Priority date Publication date Assignee Title
CH305197A (fr) * 1953-01-08 1955-02-15 Andre Strahm Machine pour le moulage d'un objet en matière thermoplastique.
GB1071340A (en) * 1965-01-27 1967-06-07 Decca Ltd Improvements in or relating to apparatus for making gramophone records
FR2336236A1 (fr) * 1975-12-22 1977-07-22 Eastman Kodak Co Machine de moulage par injection
US4340353A (en) * 1980-10-31 1982-07-20 Discovision Associates Hot sprue valve assembly for an injection molding machine
JPS57191032A (en) * 1981-05-22 1982-11-24 Asahi Chem Ind Co Ltd Hot runner mold device
US4391579A (en) * 1981-09-23 1983-07-05 Discovision Associates Hot sprue valve assembly for an injection molding machine
JPS6273916U (de) * 1985-10-28 1987-05-12
JPH0239910A (ja) * 1988-07-29 1990-02-08 Fuji Photo Film Co Ltd 光ディスク基板の製造方法
US4938681A (en) * 1989-01-03 1990-07-03 Gellert Jobst U Injection molding system having offset valve pin biasing mechanism
US4900560A (en) * 1989-03-01 1990-02-13 Panos Trakas Multi-gate molding heater assembly

Also Published As

Publication number Publication date
ES2075473T3 (es) 1995-10-01
JPH04176619A (ja) 1992-06-24
EP0556266A1 (de) 1993-08-25
JPH0710546B2 (ja) 1995-02-08
CN1072369A (zh) 1993-05-26
RU2072918C1 (ru) 1997-02-10
CZ286809B6 (cs) 2000-07-12
AU8918391A (en) 1992-06-11
HK198296A (en) 1996-11-08
CZ84193A3 (en) 1993-12-15
KR0184241B1 (en) 1999-05-15
CN1038235C (zh) 1998-05-06
DE69112221T2 (de) 1996-01-25
ATE126473T1 (de) 1995-09-15
WO1992008597A1 (en) 1992-05-29
CA2095011A1 (en) 1992-05-10
AU655443B2 (en) 1994-12-22
DE69112221D1 (de) 1995-09-21
US5324190A (en) 1994-06-28

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